Reconciliation of Shares Used in Calculating Basic and Diluted Earnings Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Basic weighted-average shares outstanding	87,080	110,932	89,080	111,166
Effect of common stock equivalents-stock options and non-vested stock under employee compensation plans	2,875	1,005	3,094	1,253
Diluted weighted-average shares outstanding	89,955	111,937	92,174	112,419
Weighted-average anti-dilutive common stock equivalents	5,083	4,956	4,305	6,008